Information:

-h

Prints this help and exits.

-v

Prints version and exits.

Two monitors:

-o

Primary monitor only.

-s

Second monitor only.

-d

Duplicates the primary monitor.

-m

Mirrors the primary monitor.

-e <side>

Extends the primary monitor to the selected side [ top | left | right | bottom ].

-n <side>

This mode selects the previous ones, one after another. The argument sets the side for the extend mode.

More monitors:

-O <mon>

Only enables the monitor with a specified id.

-S <mon1>,<mon2>:<pos>

Only enables two monitors with specified ids. The specified position places the second monitor on the right (R) or at the top (T).

Extra (in-conjunction or alone):

--dpi <dpi>

Set the DPI, a strictly positive value within the range [0 ; 27432].

--primary <mon_name>

Select a connected monitor as the primary output. Run the script without argument to print monitors information, the names are in the second column between ids and status. The primary monitor is marked by an asterisk.

Daemon mode:

-a

Performs an automatic display if it detects only one monitor.